Simultaneous visible and near-infrared time resolved observations of the outer Solar System object (29981) 1999 TD10

The outer Solar System object (29981) 1999 TD10 was observed simultaneously in the R, and J and H bands in September 2001, and in B, V, R, and I in October 2002. We derive B − V = 0.80 ± 0.05   mag , V − R = 0.48 ± 0.05   mag , R − I = 0.44 ± 0.05   mag , R − J = 1.24 ± 0.05   mag , and J − H = 0.61 ± 0.07   mag . Combining our data with the data from Rousselot et al. (2003, Astron. Astrophys. 407, 1139) we derive a synodic period of 15.382 ± 0.001   hr in agreement with the period from Rousselot et al. Our observations at the same time, with better S/N and seeing, show no evidence of a coma, contrary to the claim by Choi et al. (2003, Icarus 165, 101).